ThreadLocal.cpp revision 276479
1//===- ThreadLocal.cpp - Thread Local Data ----------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the llvm::sys::ThreadLocal class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Config/config.h" 15#include "llvm/Support/Compiler.h" 16#include "llvm/Support/ThreadLocal.h" 17 18//===----------------------------------------------------------------------===// 19//=== WARNING: Implementation here must contain only TRULY operating system 20//=== independent code. 21//===----------------------------------------------------------------------===// 22 23#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0 24// Define all methods as no-ops if threading is explicitly disabled 25namespace llvm { 26using namespace sys; 27ThreadLocalImpl::ThreadLocalImpl() : data() { } 28ThreadLocalImpl::~ThreadLocalImpl() { } 29void ThreadLocalImpl::setInstance(const void* d) { 30 static_assert(sizeof(d) <= sizeof(data), "size too big"); 31 void **pd = reinterpret_cast<void**>(&data); 32 *pd = const_cast<void*>(d); 33} 34const void* ThreadLocalImpl::getInstance() { 35 void **pd = reinterpret_cast<void**>(&data); 36 return *pd; 37} 38void ThreadLocalImpl::removeInstance() { 39 setInstance(0); 40} 41} 42#else 43 44#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_GETSPECIFIC) 45 46#include <cassert> 47#include <pthread.h> 48#include <stdlib.h> 49 50namespace llvm { 51using namespace sys; 52 53ThreadLocalImpl::ThreadLocalImpl() : data() { 54 static_assert(sizeof(pthread_key_t) <= sizeof(data), "size too big"); 55 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 56 int errorcode = pthread_key_create(key, nullptr); 57 assert(errorcode == 0); 58 (void) errorcode; 59} 60 61ThreadLocalImpl::~ThreadLocalImpl() { 62 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 63 int errorcode = pthread_key_delete(*key); 64 assert(errorcode == 0); 65 (void) errorcode; 66} 67 68void ThreadLocalImpl::setInstance(const void* d) { 69 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 70 int errorcode = pthread_setspecific(*key, d); 71 assert(errorcode == 0); 72 (void) errorcode; 73} 74 75const void* ThreadLocalImpl::getInstance() { 76 pthread_key_t* key = reinterpret_cast<pthread_key_t*>(&data); 77 return pthread_getspecific(*key); 78} 79 80void ThreadLocalImpl::removeInstance() { 81 setInstance(nullptr); 82} 83 84} 85 86#elif defined(LLVM_ON_UNIX) 87#include "Unix/ThreadLocal.inc" 88#elif defined( LLVM_ON_WIN32) 89#include "Windows/ThreadLocal.inc" 90#else 91#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 set in Support/ThreadLocal.cpp 92#endif 93#endif 94